Electrical heater



F. KUHN AND J. A. HAND.

ELECTRICAL HEATER.

APPLICATION FILED JUNE 15, I518.

1,41 9,935 Patented June 20, 1922.

3 SHEETSSHEET I.

awuemtozs [311 if #17? Jay Jian a F. KUHN AND J. A. HAND.

ELECTRICAL'HEATER.

APPLICATION FILED JUNE 15, 1918.

Patented June 20, 1922.

3 SHEETSSHEET 2- F. KUHN AND J. A. HAND.

ELECTRICAL HEATER.

APPLICATION FILED JUNE 15, 1918- Patented June 20, 1922.

3 SHEETSSHEET 3.

UNITED STATES "PATENT omcr.

FRANK KUHN AND JAY A. HAN D, OF DETROIT, MICHIGAN, .ASSIGNORS 'I'O AMERICAN ELECTRICAL HEATER COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

To all whom it may concern.

Be it known that we, FRANK KU N and J AY A. HAND, citizens of the United 'States'of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Electrical Heaters, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention .relates to luminous electric heaters and more particularly to electric heaters of the type in which a heating element is mounted substantially at the focus of a concave reflector.

The invention consists in various structural features, including the employment of a common means for detachably holding the reflector upon its support and for detachably mounting a guard in front of the heating unit, the establishment of a connection be tween the heater and its supporting standard such that any desired direction may be given to the radiant heat, the mounting of a plurality of these heaters upon a common standard, and making provision for independent adjustment thereof with relation to said standard, and providing for the establishment of the electrical connections and for a location for said connections within the standard, such as to facilitate the assembly and repair of the heater.

In the accompanying drawings: v

Figure 1 is a front view of the heater;

Figure l is a top view of the heater illustrating the relative adjustability of the duplicate heating devices;

igure 2 is a vertical sectional viewxtaken on line 2-2 of Figurel, showing the provision of establishing the electrical connections within the standard;

Figure 3 is a sectional view taken on line 3-3 of Figure 2, showing the pivotal connection of the heater supporting arms with the standard; Figure 4 is a section taken on line 44 of Figure 1, showing the mounting of one of the heating units and its reflectorupon a suport- I Figure 5 is a rear view of one side of the heater.

Figure 6 is a perspective view showing in disassembled relation the adjoining portion of the standard and one of the arms which ELECTRICAL HEATER.

1918. Serial No. 240,149.

. support the heating devices, the slotted plate used in connecting said parts being also illustrated in this view.

In these views the reference character 1 designates a base, and 2 a hollow standard centrally rising from said base. Upon the upper portlon of said standard there is mounted a pair of duplicate heaters one at each side of the standard, each comprising a blfurcated arm 3 pivotally engaging the standard, the pivotal axes of said arms being in alignment, a dished head pivotally carried at the outer end of each of said arms, a socket member 5 disposed within each of said heads, a heating unit 6 detachably engaging each socket member, and a reflector7 secured to each of said heads andhaving said heat ng unit arranged at substantially the focus thereof. Preferably said reflectors are of an ellipsoidal shape so that their reflected rays may be brought to a focus at a predetermined point in front of said reflector.

Each of the heating units 6 comprises-an insulating core 8 having a resistor 9 wound thereupon, said core being mounted upon a bolt 10 which is engaged with a bracket 11, saidbracket having a pair of contact pins 12 projecting therefrom with which the terminals of said resistor respectively have electrical connection.

spaced relation to the wall thereof and is secured to said head by the bolts 15. An annular seriesof apertures 16 is formed in each head 4 in communication with the space between said head and the socket member, thus providing for a circulation of air through the head.

The pivotal joint between each head 4 and the corresponding arm 3 is established by forming upon the head a pair of lugs 17, which project between the furcations of the adjacent arms and are pivoted respectively thereto by bolts 18. The inner ends of these bolts engage disc-shaped nuts 19 which clamp the lugs 17 against the furcations of the arm 3 with sufiicient pressure to maintain the head 4 fixed in various positions of angular adjustment. The rotation of the nuts 19 is prevented by peripherally forming the same with lugs 20 which are bent at a right angle and inserted in apertures in the furcations of the arm. The angular movement of each head 4: is limited by forming the lugs 17 thereof with projections 21, which coact with the lugs 20 to form stops.

To pivotally mount each arm 3 upon the standard 2, registering apertures 22 are formed in each arm'and the adjacent wall of the standard and within said apertures there is inserted a collar 23 having a flange 24 bearing upon the arm and formed with an annular groove 25 which is engaged by a locking plate 26 within the standard, said plate being slotted, as indicated at 27, to fit said groove. Said plate is bowed and is formed of resilient material so that when it is forced downwardly to engage the slot 27 with the groove 25, an axial stress will be exerted upon the collar 23 and through said collar upon a corresponding arm 3 causing the latter to engage the standard with sufficient pressure to maintain it fixed in various positions of angular adjustment. The apertures 22 of the standard are formed with spaced radial shoulders 28, which shoulders are engageable by a lug 29 projecting from the adjacent arm 3 to limit the permissible limited movement of the arm. Preferably the rotation of the .arm 3 will be limited to an arc of ninety degrees, that is to say between positions corresponding to a forwardly directed and anupwardly directed position of the reflector.

The rear wall 30 of the standard 2 is detachably held in place by screws 31, and said Wall carries upon its lower portion a socket member 32 which is located within the standard when the heater is assembled. Within said socket is arranged a pair of contact pins 32 which may be detachably engaged by a plug (not shown). The pins 32 respectively have an electrical connection with a pair of binding posts 33 with which conductors 3d are engaged within the standard, said conductors extending to the upper portion of the standard and there passing through the collars 23 and between the furcations of the arms 3 to the respective heads 4.

The standard 2 is surmounted by adeta chable cap 35, the front and rear walls'of said cap and standard being formed with registering slots 36 through which are passed the bent lower ends 37- of a handle member 38, whereby the cap is held in place upon the standard. The resiliency of the handle member serves to permit engagementand disengagement of its extremities 37 from said slots.

The heads 4 are respectively formed with annular flanges 39 at their edges against which the reflectors are respectively seated. \Vith each of said flanges there are engaged the inner extremities of a plurality of arms argest guard members 4.3 positioned centrally at thefront of the reflectors. The axes of the pivotal connections between each arm 3 and the standard 2 and corresponding head 4 are in transverse relation so that the two said pivotal connections coact to secure the effect of a universal oint permitting the direction of the radiant heat to be varied through a wide range. Also by swinging the heads 4 slightly toward each other about their connections with the arms 3, the radiant heat emanating from both heating units may be concentrated in an area not far from the heater. It is to be noted that the arms 40 perform the dual function of retaining the reflectors in proper relation to the heating units and retaining the guard in proper relation both to the heating units and reflectors. The reflectors are each formed with an aperture at their centers of a diameter somewhat greater than-that of the heating units so that after the fastening devices have been released, the reflectors may be removed without disturbing the heating units. The ready detachability of the reflectors is an important feature since it permits of 'the reflectors being stored in a nested relation to each other separate from the heaters and being quickly applied to the heaters when the latter are ready for use. By mounting the socket member 32 with its terminals 33 upon a removable wall 30 of the standard,

it becomes possible to engage the conductors 34 with said terminals without the workmen being hampered for lack of room and after the connections have been established, the conductors may be thrust into the standard as the wall 30 is being shifted to its proper relation to the standard.

What we claim as our invention, is:

1. The combination with a support and an electric heating device, of an arm having its extremities respectively pivotally connected to said heating device and .support, the axes of said pivotal connections being transverse to each other, and means creating frictional resistance at each of said joints to hold the parts adjusted in various angular relations.

2. An electric heater comprising a standard, a' heating device, an arm supporting said heating device, an annularly grooved collar mounted in registering apertures of said arm and standard, said collar having a portion bearing upon the arm-to hold the same against the standard, and a member interior to the standard formed with a slot engaging the annular groove of said collar, said member being bowed to subject said collar to an axial stress, whereby said arm is held firmly engaged with said standard to means limiting relative angular movement at resist relative rotation. each of said pivotal connections.

3. An electric heater comprising a sup- In testimonywhereof we aflix our signa 10 port, a heating device, an arm having its tures. 5 extremities respectively pivotally connected to said heating device and support, the pivv FRANK KUHN. otal axes being substantially transverse and JAY HAN D. 

